Mobile terminal

ABSTRACT

A mobile terminal includes a first frame, a second frame slidably-movable in a first direction or in a second direction opposite to the first direction from the first frame, a slide frame movable in the first direction or in the second direction with respect to the second frame, a flexible display unit including a first region coupled to the first frame, a second region coupled to the slide frame, and a third region positioned between the first region and the second region and bent while surrounding the second frame, a driving unit disposed to be positionally biased in a third direction perpendicular to the first direction, wherein the driving unit provides a force to the second frame to move, and a linear guide positioned between the first frame and the second frame and guiding the movement of the second frame in the first direction or in the second direction. The mobile terminal may improve durability of the flexible display unit by not restricting a point where the flexible display unit is bent to a specific position.

This application claims the benefit of earlier filing date and right of priority to U.S. Provisional Application No. 62/805,920, filed on Feb. 14, 2019 and is a continuation of PCT International Application No. PCT/KR2019/016907, filed on Dec. 3, 2019, the contents of which are all incorporated by reference herein in its entirety.

BACKGROUND Field

The present disclosure relates to a mobile terminal, and more particularly, to a mobile terminal that has a flexible display and is capable of extending a size of a screen while the display is scrolled and slid at the same time.

Discussion of the Related Art

Terminals may be generally classified as mobile/portable terminals or stationary terminals according to their mobility. Mobile terminals may also be classified as handheld terminals or vehicle mounted terminals according to whether or not a user can directly carry the terminal.

A display device is a device having a function of receiving, processing, and displaying a video that a user may watch. For example, the display device receives a broadcast selected by the user from broadcast signals transmitted from a broadcasting station, separates a video signal from the received signals, and displays the separated video signal on a display.

In recent years, because of a development of a broadcasting technology and a network technology, functions of the display device have also been considerably diversified, and a performance of the device has been improved accordingly. That is, the display device has been developed to provide not only broadcast contents but also various other contents to the user. For example, the display device may provide game play, music listening, internet shopping, user customized information, and the like using various applications as well as programs received from the broadcasting station. In order to perform such extended functions, the display device may be basically connected to other devices or networks using various communication protocols, and may provide the user with an ubiquitous computing environment. In other words, the display device has evolved into a smart device that enables connectivity to a network and continuous computing.

Recently, a flexible display, which has sufficient elasticity, and thus, be able to be deformed largely, has been developed. A size of the mobile terminal may be varied using a deforming property of the flexible display. In the mobile terminal having such a variable structure, a change in the structure of the mobile terminal must be performed stably. Further, a support structure and the like of the variable display unit may be a problem.

SUMMARY

One purpose of the present disclosure is to provide a mobile terminal that may improve durability of a flexible display unit by not restricting a point where the flexible display unit is bent to a specific position.

Another purpose of the present disclosure is to provide a mobile terminal including a support structure of a flexible display unit that may stably support the flexible display unit when the flexible display unit is extended.

Another purpose of the present disclosure is to prevent a flexible display unit from being damaged by an external impact on a side where the flexible display unit is bent.

One aspect of the present disclosure proposes a mobile terminal including a first frame, a second frame slidably-movable in a first direction or in a second direction opposite to the first direction from the first frame, a slide frame movable in the first direction or in the second direction with respect to the second frame, a flexible display unit including a first region coupled to the first frame, a second region coupled to the slide frame, and a third region positioned between the first region and the second region and bent while surrounding the second frame, a driving unit disposed to be positionally biased in a third direction perpendicular to the first direction, wherein the driving unit provides a force to the second frame to move, and a linear guide positioned between the first frame and the second frame and guiding the movement of the second frame in the first direction or in the second direction.

In one implementation, the linear guide may include a pair of linear guides respectively disposed at both ends of each of the first frame and the second frame in the third direction.

In one implementation, the linear guide may include a guide rail coupled to one of the first and second frames and extending in the first direction, and a guide block coupled to the other of the first and second frames and having a guide groove defined therein for inserting the guide rail therein, and the guide rail may have a plurality of screw holes defined therein for coupling with one of the first and second frames.

In one implementation, the linear guide may include a bearing ball or a polyoxymethylene (POM) rail of the guide block positioned between the guide rail and the guide block.

In one implementation, the driving unit may include a motor coupled to the first frame, a planetary gear connected to the motor, a pinion gear receiving a force through the planetary gear, and a rack gear fastened to the second frame and extending in the first direction, wherein the rack gear is engaged with the pinion gear to receive a rotational force of the pinion gear and convert the rotational force into a linear motion.

In one implementation, a first end of the display unit may form a curved face in the second direction, and the first frame may further include a curved face bracket for supporting a rear face of the first end of the display unit and a display decor opposite to the curved face bracket and covering a front face of the first end of the display unit.

In one implementation, the first frame may include a first front portion to be coupled with a first region of the display unit and a first rear portion spaced apart from the first front portion in a rearward direction, the second frame may include a second front portion positioned on a rear face of the first front portion and a second rear portion for covering a portion of a rear face of the first rear portion, and the mobile terminal may further include an optical component disposed in an exposed rear portion of the first rear portion not overlapping the second rear portion.

In one implementation, the mobile terminal may further include an electronic component disposed between the first front portion and the first rear portion and a separating plate for covering a front face of the electronic component, and the second front portion may move between the first front portion and the separating plate.

In one implementation, the slide frame may be slidably coupled to a rear face of the second rear portion in the first direction, and the second frame may further include a rear face cover for covering the slide frame and a portion of the display unit positioned on the second rear portion.

In one implementation, the mobile terminal may further include a display flexible substrate extending from an end of the second region of the display unit and a main board mounted on the first frame, and the display flexible substrate may be rolled on the roller and fastened to the main board.

In one implementation, the first frame further may include the first front portion positioned on a rear face of the first region of the flexible display unit, and the support frame may have a thickness corresponding to a thickness of the first front portion.

In one implementation, a moving distance in the first direction of the second frame with respect to the first frame may be equal to a moving distance in the first direction of the slide frame with respect to the second frame.

In one implementation, the first frame may include an exposed rear portion not overlapping the flexible display unit, and the mobile terminal may further include a camera positioned on the exposed rear portion.

In one implementation, the second frame may further include a side frame located at an end of the second frame in the first direction and covering at least a portion of the third region of the flexible display unit.

The mobile terminal of the present disclosure reduces a friction between the first frame and the second frame through a simple slide structure, so that conversion between a first state and a second state is easy.

In addition, the mobile terminal of the present disclosure may support an extended flexible display unit through a link.

In addition, a first link may cover an interior of the mobile terminal so as not to be exposed in the second state, and a second link may include an elastic member to guide the state conversion of the mobile terminal to be achieved semi-automatically.

Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given herein below and the accompanying drawings, which are given by illustration only, and thus are not limitative of the present invention, and wherein:

FIG. 1 is a block diagram of a mobile terminal in accordance with the present disclosure.

FIG. 2 is an exploded perspective view of a mobile terminal according to one embodiment;

FIG. 3 shows perspective views respectively illustrating a first state and a second state viewed from one side of a mobile terminal according to one embodiment;

FIG. 4 shows rear face views respectively illustrating a first state and a second state of a mobile terminal according to one embodiment;

FIG. 5 shows cross-sectional views respectively taken along a line A-A and a line B-B of FIG. 3;

FIG. 6 is a diagram illustrating various embodiments of a side frame of a roll-slide mobile terminal associated with the present disclosure;

FIG. 7 illustrates cross-sectional views respectively taken along a line E-E, a line F-F, and a line G-G of FIG. 6;

FIGS. 8 to 12 are views illustrating an assembly sequence of a mobile terminal;

FIG. 13 is a diagram for describing an operation of a motor according to one embodiment of a roll-slide mobile terminal associated with the present disclosure;

FIG. 14 is a diagram illustrating an embodiment of a driving unit of a mobile terminal;

FIG. 15 shows cross-sectional views respectively taken along a line C-C and a line D-D of FIG. 3; and

FIGS. 16 to 18 are diagrams illustrating various embodiments of a linear guide of a mobile terminal.

DESCRIPTION OF SPECIFIC EMBODIMENTS

Description will now be given in detail according to exemplary embodiments disclosed herein, with reference to the accompanying drawings. For the sake of brief description with reference to the drawings, the same or equivalent components may be provided with the same reference numbers, and description thereof will not be repeated. In general, a suffix such as “module” and “unit” may be used to refer to elements or components. Use of such a suffix herein is merely intended to facilitate description of the specification, and the suffix itself is not intended to give any special meaning or function. In the present disclosure, that which is well-known to one of ordinary skill in the relevant art has generally been omitted for the sake of brevity. The accompanying drawings are used to help easily understand various technical features and it should be understood that the embodiments presented herein are not limited by the accompanying drawings. As such, the present disclosure should be construed to extend to any alterations, equivalents and substitutes in addition to those which are particularly set out in the accompanying drawings.

It will be understood that although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are generally only used to distinguish one element from another.

It will be understood that when an element is referred to as being “connected with” another element, the element can be directly connected with the other element or intervening elements may also be present. In contrast, when an element is referred to as being “directly connected with” another element, there are no intervening elements present.

A singular representation may include a plural representation unless it represents a definitely different meaning from the context.

Terms such as “include” or “has” are used herein and should be understood that they are intended to indicate an existence of several components, functions or steps, disclosed in the specification, and it is also understood that greater or fewer components, functions, or steps may likewise be utilized.

FIG. 1 is a block diagram of a mobile terminal in accordance with the present disclosure.

The mobile terminal 100 is shown having components such as a wireless communication unit 110, an input unit 120, a sensing unit 140, an output unit 150, an interface unit 160, a memory 170, a controller 180, and a power supply unit 190. Referring now to FIG. 1, the mobile terminal 100 is shown having wireless communication unit 110 configured with several commonly implemented components. It is understood that implementing all of the illustrated components is not a requirement, and that greater or fewer components may alternatively be implemented.

More specifically, the wireless communication unit 110 typically includes one or more modules which permit communications such as wireless communications between the mobile terminal 100 and a wireless communication system, communications between the mobile terminal 100 and another mobile terminal, communications between the mobile terminal 100 and an external server. Further, the wireless communication unit 110 typically includes one or more modules which connect the mobile terminal 100 to one or more networks.

To facilitate such communications, the wireless communication unit 110 includes one or more of a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short-range communication module 114, and a location information module 115.

Regarding the wireless communication unit 110, the broadcast receiving module 111 is typically configured to receive a broadcast signal and/or broadcast associated information from an external broadcast managing entity via a broadcast channel. The broadcast channel may include a satellite channel, a terrestrial channel, or both. In some embodiments, two or more broadcast receiving modules 111 may be utilized to facilitate simultaneously receiving of two or more broadcast channels, or to support switching among broadcast channels.

The mobile communication module 112 can transmit and/or receive wireless signals to and from one or more network entities. Typical examples of a network entity include a base station, an external mobile terminal, a server, and the like. Such network entities form part of a mobile communication network, which is constructed according to technical standards or communication methods for mobile communications (for example, Global System for Mobile Communication (GSM), Code Division Multi Access (CDMA), CDMA2000(Code Division Multi Access 2000), EV-DO(Enhanced Voice-Data Optimized or Enhanced Voice-Data Only), Wideband CDMA (WCDMA), High Speed Downlink Packet access (HSDPA), HSUPA (High Speed Uplink Packet Access), Long Term Evolution (LTE) , LTE-A(Long Term Evolution-Advanced), and the like).

Examples of wireless signals transmitted and/or received via the mobile communication module 112 include audio call signals, video (telephony) call signals, or various formats of data to support communication of text and multimedia messages.

The wireless Internet module 113 is configured to facilitate wireless Internet access. This module may be internally or externally coupled to the mobile terminal 100. The wireless Internet module 113 may transmit and/or receive wireless signals via communication networks according to wireless Internet technologies.

Examples of such wireless Internet access include Wireless LAN (WLAN), Wireless Fidelity (Wi-Fi), Wi-Fi Direct, Digital Living Network Alliance (DLNA), Wireless Broadband (WiBro), Worldwide Interoperability for Microwave Access (WiMAX), High Speed Downlink Packet Access (HSDPA), HSUPA (High Speed Uplink Packet Access), Long Term Evolution (LTE), LTE-A(Long Term Evolution-Advanced), and the like. The wireless Internet module 113 may transmit/receive data according to one or more of such wireless Internet technologies, and other Internet technologies as well.

In some embodiments, when the wireless Internet access is implemented according to, for example, WiBro, HSDPA, HSUPA, GSM, CDMA, WCDMA, LTE, LTE-A and the like, as part of a mobile communication network, the wireless Internet module 113 performs such wireless Internet access. As such, the wireless Internet module 113 may cooperate with, or function as, the mobile communication module 112.

The short-range communication module 114 is configured to facilitate short-range communications. Suitable technologies for implementing such short-range communications include BLUETOOTH™, Radio Frequency IDentification (RFID), Infrared Data Association (IrDA), Ultra-WideBand (UWB), ZigBee, Near Field Communication (NFC), Wireless-Fidelity (Wi-Fi), Wi-Fi Direct, Wireless USB (Wireless Universal Serial Bus), and the like. The short-range communication module 114 in general supports wireless communications between the mobile terminal 100 and a wireless communication system, communications between the mobile terminal 100 and another mobile terminal 100, or communications between the mobile terminal and a network where another mobile terminal 100 (or an external server) is located, via wireless area networks. One example of the wireless area networks is a wireless personal area networks.

The location information module 115 is generally configured to detect, calculate, derive or otherwise identify a position of the mobile terminal. As an example, the location information module 115 includes a Global Position System (GPS) module, a Wi-Fi module, or both. If desired, the location information module 115 may alternatively or additionally function with any of the other modules of the wireless communication unit 110 to obtain data related to the position of the mobile terminal. As one example, when the mobile terminal uses a GPS module, a position of the mobile terminal may be acquired using a signal sent from a GPS satellite. As another example, when the mobile terminal uses the Wi-Fi module, a position of the mobile terminal can be acquired based on information related to a wireless access point (AP) which transmits or receives a wireless signal to or from the Wi-Fi module.

The input unit 120 includes a camera 121 for obtaining images or video, a microphone 122, which is one type of audio input device for inputting an audio signal, and a user input unit 123 (for example, a touch key, a push key, a mechanical key, a soft key, and the like) for allowing a user to input information. Data (for example, audio, video, image, and the like) is obtained by the input unit 120 and may be analyzed and processed by controller 180 according to device parameters, user commands, and combinations thereof

Such cameras 121 may process image frames of still pictures or video obtained by image sensors in a video or image capture mode. The processed image frames can be displayed on the display unit 151 or stored in memory 170. In some cases, the cameras 121 may be arranged in a matrix configuration to permit a plurality of images having various angles or focal points to be input to the mobile terminal 100. As another example, the cameras 121 may be located in a stereoscopic arrangement to acquire left and right images for implementing a stereoscopic image.

The microphone 122 is generally implemented to permit audio input to the mobile terminal 100. The audio input can be processed in various manners according to a function being executed in the mobile terminal 100. If desired, the microphone 122 may include assorted noise removing algorithms to remove unwanted noise generated in the course of receiving the external audio.

The user input unit 123 is a component that permits input by a user. Such user input may enable the controller 180 to control operation of the mobile terminal 100. The user input unit 123 may include one or more of a mechanical input element (for example, a key, a button located on a front and/or rear surface or a side surface of the mobile terminal 100, a dome switch, a jog wheel, a jog switch, and the like), or a touch-sensitive input, among others. As one example, the touch-sensitive input may be a virtual key or a soft key, which is displayed on a touch screen through software processing, or a touch key which is located on the mobile terminal at a location that is other than the touch screen. On the other hand, the virtual key or the visual key may be displayed on the touch screen in various shapes, for example, graphic, text, icon, video, or a combination thereof

The sensing unit 140 is typically implemented using one or more sensors configured to sense internal information of the mobile terminal, the surrounding environment of the mobile terminal, user information, and the like. For example, the sensing unit 140 may alternatively or additionally include other types of sensors or devices, such as a proximity sensor 141 and an illumination sensor 142, a touch sensor, an acceleration sensor, a magnetic sensor, a G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared (IR) sensor, a finger scan sensor, a ultrasonic sensor, an optical sensor (for example, camera 121), a microphone 122, a battery gauge, an environment sensor (for example, a barometer, a hygrometer, a thermometer, a radiation detection sensor, a thermal sensor, and a gas sensor, among others), and a chemical sensor (for example, an electronic nose, a health care sensor, a biometric sensor, and the like), to name a few. The mobile terminal 100 may be configured to utilize information obtained from sensing unit 140, and in particular, information obtained from one or more sensors of the sensing unit 140, and combinations thereof.

The output unit 150 is typically configured to output various types of information, such as audio, video, tactile output, and the like. The output unit 150 is shown having a display unit 151, an audio output module 152, a haptic module 153, and an optical output module 154. The display unit 151 may have an inter-layered structure or an integrated structure with a touch sensor in order to facilitate a touch screen. The touch screen may provide an output interface between the mobile terminal 100 and a user, as well as function as the user input unit 123 which provides an input interface between the mobile terminal 100 and the user.

The audio output module 152 is generally configured to output audio data. Such audio data may be obtained from any of a number of different sources, such that the audio data may be received from the wireless communication unit 110 or may have been stored in the memory 170. The audio data may be output during modes such as a signal reception mode, a call mode, a record mode, a voice recognition mode, a broadcast reception mode, and the like. The audio output module 152 can provide audible output related to a particular function (e.g., a call signal reception sound, a message reception sound, etc.) performed by the mobile terminal 100. The audio output module 152 may also be implemented as a receiver, a speaker, a buzzer, or the like.

A haptic module 153 can be configured to generate various tactile effects that a user feels, perceive, or otherwise experience. A typical example of a tactile effect generated by the haptic module 153 is vibration. The strength, pattern and the like of the vibration generated by the haptic module 153 can be controlled by user selection or setting by the controller. For example, the haptic module 153 may output different vibrations in a combining manner or a sequential manner.

An optical output module 154 can output a signal for indicating an event generation using light of a light source. Examples of events generated in the mobile terminal 100 may include message reception, call signal reception, a missed call, an alarm, a schedule notice, an email reception, information reception through an application, and the like.

The interface unit 160 serves as an interface with various types of external devices that can be coupled to the mobile terminal 100. The interface unit 160, for example, may include any of wired or wireless ports, external power supply ports, wired or wireless data ports, memory card ports, ports for connecting a device having an identification module, audio input/output (I/O) ports, video I/O ports, earphone ports, and the like. In some cases, the mobile terminal 100 may perform assorted control functions associated with a connected external device, in response to the external device being connected to the interface unit 160.

The memory 170 is typically implemented to store data to support various functions or features of the mobile terminal 100. For instance, the memory 170 may be configured to store application programs executed in the mobile terminal 100, data or instructions for operations of the mobile terminal 100, and the like. Some of these application programs may be downloaded from an external server via wireless communication. Other application programs may be installed within the mobile terminal 100 at time of manufacturing or shipping, which is typically the case for basic functions of the mobile terminal 100 (for example, receiving a call, placing a call, receiving a message, sending a message, and the like). It is common for application programs to be stored in the memory 170, installed in the mobile terminal 100, and executed by the controller 180 to perform an operation (or function) for the mobile terminal 100.

The controller 180 typically functions to control overall operation of the mobile terminal 100, in addition to the operations associated with the application programs. The controller 180 may provide or process information or functions appropriate for a user by processing signals, data, information and the like, which are input or output, or activating application programs stored in the memory 170.

To drive the application programs stored in the memory 170, the controller 180 may be implemented to control a predetermined number of the components mentioned above in reference with FIG. 1A. Moreover, the controller 180 may be implemented to combinedly operate two or more of the components provided in the mobile terminal 100 to drive the application programs.

The power supply unit 190 can be configured to receive external power or provide internal power in order to supply appropriate power required for operating elements and components included in the mobile terminal 100. The power supply unit 190 may include a battery, and the battery may be configured to be embedded in the terminal body, or configured to be detachable from the terminal body.

Some or more of the components may be operated cooperatively to embody an operation, control or a control method of the mobile terminal in accordance with embodiments of the present disclosure. Also, the operation, control or control method of the mobile terminal may be realized on the mobile terminal by driving of one or more application problems stored in the memory 170.

FIG. 2 is an exploded perspective view of a mobile terminal according to one embodiment. Further, FIG. 3 shows perspective views respectively illustrating a first state and a second state viewed from one side of a mobile terminal according to one embodiment. Further, FIG. 4 shows rear face views respectively illustrating a first state and a second state of a mobile terminal according to one embodiment. Further, FIG. 5 shows cross-sectional views respectively taken along a line A-A and a line B-B of FIG. 3. In these drawings, FIGS. 3A, 4A, and 5A show a first state of the mobile terminal, and FIGS. 3B, 4B, and 5B show a second state of the mobile terminal.

As shown, a mobile terminal 100 in a first state is contracted, and has a smaller size than the mobile terminal 100 in a second state. In addition, a size of a display unit 151 located disposed on a front face of the mobile terminal 100 also becomes smaller than that of the display unit 151 in the second state. The mobile terminal 100 of the first state is expanded in a first direction D1 to be in the second state. In the second state, a size of the mobile terminal 100 and a size of the front face of the display unit 151 become larger than that in the first state as shown in FIG. 3B, and a size of the rear face of the display unit 151 is reduced as shown in FIG. 4B. That is, the display unit 151 positioned on the rear face of the mobile terminal 151 in the first state moves to the front face of the mobile terminal 100 in the second state.

In a following description, a direction in which the mobile terminal 100 and the display 151 thereof are extended or enlarged is referred to as a first direction D1, a direction in which the mobile terminal 100 and the display 151 thereof are contracted or retracted, or reduce to be converted into the first state from the second state is referred to as a second direction D2, and a direction perpendicular to the first and second directions D1 and D2 is referred to as a third direction.

As such, the display unit may use a flexible display unit 151 that may be bent such that the position of the display unit may be varied. The flexible display is a lightweight, unbreakable, and durable display that is built on a thin and flexible substrate that may be bent, crooked, folded, twisted, or rolled while retaining properties of a conventional flat panel display.

In addition, an electronic paper is a display technology to which properties of general ink are applied. The electronic paper may be different from the conventional flat panel display in using reflected light. The electronic paper may change information using a twisted ball or electrophoresis using a capsule.

In a state in which the flexible display unit 151 is not deformed (e.g., a state of having an infinite curvature radius, hereinafter referred to as a basic state), a display region of the flexible display unit 151 becomes flat. In a state in which the flexible display unit 151 is deformed by an external force from the basic state (e.g., a state of having a finite radius of curvature, hereinafter referred to as a deformed state), the display region may become a curved face. As shown, information displayed in the deformation state may be visual information output on the curved face. Such visual information is implemented by independently controlling light emission of sub-pixels arranged in a matrix. The sub-pixel refers to a minimum unit for implementing one color.

The flexible display unit 151 may be in a curved state (e.g., a vertically or horizontally curved state) rather than a flat state in the basic state. In this case, when the external force is applied to the flexible display unit 151, the flexible display unit 151 may be deformed into the flat state (or a less curved state) or more curved state.

The flexible display unit 151 may be combined with a touch sensor to implement a flexible touch screen. When a touch is made on the flexible touch screen, the controller 180 (see FIG. 1) may perform control corresponding to such touch input. The flexible touch screen may be configured to detect the touch input in the deformed state as well as in the basic state.

The touch sensor detects the touch (or touch input) applied on the touch screen using at least one of various touch schemes such as a resistive film scheme, a capacitance scheme, an infrared scheme, an ultrasonic wave scheme, a magnetic field scheme, and the like.

As an example, the touch sensor may be configured to convert a change in pressure applied on a specific portion of the touch screen, capacitance generated at the specific portion, or the like into an electrical input signal. The touch sensor may be configured such that a touch object applying a touch on the touch screen may detect touched position and area on the touch sensor, a pressure during the touch, a capacitance during the touch, and the like.

Further, the mobile terminal 100 may have a deformation detection means for detecting the deformation of the flexible display unit 151. Such deformation detection means may be included in the sensing unit 140 (see FIG. 1).

The deformation detection means may be disposed in the flexible display unit 151 or a case (first to second frames 101 to 102 to be described later) to detect information related to the deformation of the flexible display unit 151. In this connection, the information related to the deformation may include a direction in which the flexible display unit 151 is deformed, a degree of the deformation, a deformed position, a deformed time, an acceleration at which the deformed flexible display unit 151 is restored, and the like. In addition, the information related to the deformation may be various information that may be detected due to the bending of the flexible display unit 151.

In addition, the controller 180 may change information displayed on the flexible display unit 151 or generate a control signal for controlling a function of the mobile terminal 100 based on the information related to the deformation of the flexible display unit 151 detected by the deformation detection means.

The state conversion (first or second state) of the flexible display unit 151, i.e., the size change at the front and rear faces of the mobile terminal 100 of the display unit 151 based on the size change of the mobile terminal 100 may be performed manually by a force applied by the user, but may be not limited to such manual scheme. For example, when the mobile terminal 100 or the flexible display unit 151 is in the first state, the mobile terminal 100 or the flexible display unit 151 may be converted into the second state by the user or an application command without the external force applied by the user. As such, in order for the flexible display unit 151 to be automatically deformed without the external force, the mobile terminal 100 may include a driving unit 200 to be described later.

The flexible display unit 151 of the present disclosure is bent 180 degrees while being rolled on a side of the mobile terminal 100 in the first direction. Thus, a portion of the display unit 151 is disposed on the front face of the mobile terminal 100 based on such side, and the other portion thereof is disposed on the rear face of the mobile terminal 100. A portion of the display unit 151 located on the front face of the mobile terminal 100 may be fixed to the front face so as not to move. Further, the other portion thereof located on the rear face of the mobile terminal 100 may be movable to the rear face.

In addition, the display unit 151 may be rolled on or released from the side. Accordingly, the portion disposed on the rear face of the mobile terminal 100 moves, so that the size of the portion disposed on the front face of the mobile terminal 100 may be adjusted. Since the area of the flexible display unit 151 is determined and the flexible display unit 151 is formed of one continuous body, an area of the portion on the rear face decreases as an area of the portion on the front face increases. Such a display unit 151 may be rolled in a second frame 102, which is movable relative to a first frame 101 to be described later, more correctly, on one of sides of the second frame 102. The display unit 151 may be withdrawn or pulled out from or inserted or pushed into the second frame 102 while being rolled in the second frame 102 along a moving direction of the second frame 102 to adjust the area of the display unit 151 on the front face of the mobile terminal 100. Such operation will be described in more detail below along with other relevant components of the mobile terminal 100.

Typically, an antenna is disposed in the case or the housing of the mobile terminal 100, but a portion where the antenna is installed in the case or the housing may be limited because of the flexible display unit 151 that covers not only the front face of the mobile terminal 100 but also the rear face thereof. For this reason, the antenna may be implemented on the flexible display unit 151. An antenna on display (AOD) is an antenna in which a transparent film is formed by stacking an electrode layer and a dielectric layer that have patterns engraved thereon, respectively. The antenna on display may be implemented thinner than an antenna implemented using a laser direct structuring (LDS) technology using a conventional copper nickel plating scheme, so that the antenna on display may not be exposed to the outside without affecting a thickness. In addition, the antenna on display may transmit and receive a signal directly to or from the display unit 151. Accordingly, the antenna on display may be used in the mobile terminal 100 in which the display unit 151 is located on the both faces of the mobile terminal 100 as in the present disclosure.

The mobile terminal 100 of the present disclosure includes frames 101 and 102 in which components are mounted, and the frames 101 and 102 of the present disclosure may vary in size in the first direction as shown in FIG. 2. One or more frames 101 and 102 move relative to each other, and sizes thereof may vary in the first direction. Electronic components are mounted in the frames 101 and 102, and the flexible display unit 151 is located out of the frames 101 and 102.

Since the mobile terminal 100 of the present disclosure includes the flexible display unit 151, the flexible display unit 151 may be combined in a form surrounding front faces and rear faces of the frames 101 and 102. The frame may include the first frame 101 and the second frame 102 moving in the first direction with respect to the first frame 101. The first frame 101 and the second frame 102 include front portions, a rear portions, and side portions, respectively, and are coupled to each other. Thus, the mobile terminal 100 may have a hexahedral outer shape by such coupled first and second frames 101 and 102.

First, the first frame 101 corresponds to a main body of the mobile terminal 100, and may have a space therein for accommodating various components. In addition, the first frame 101 may accommodate the second frame 102 movably coupled to the first frame 101 in such a space. More specifically, as shown in FIGS. 2 and 5, the first frame 101 may include a first front portion 1011 disposed at a front portion of the mobile terminal 100 and supporting the front face of the display unit 151 and a first rear portion 1012 disposed at a rear portion of the mobile terminal and on which various components are mounted.

The first front portion 1011 and the first rear portion 1012 may be spaced apart from each other at a predetermined spacing to define a predetermined space therebetween, and may be connected to each other by a side portion 1014. The side portion 1014 may be integrally formed with the first rear portion 1012 or the first front portion 1011. The camera 121, the audio output module 152, and the input/output terminal 161, the controller 180, and the power supply unit 190 may be accommodated as components of the mobile terminal 100 in the space in the first frame 101. For example, the controller 180 may be a circuit board 181 including a processor and an electronic circuit for controlling the operation of the mobile terminal, and the power supply unit 190 may be a battery 191 and related components. In addition, the driving unit 200 that controls the slide movement of the second frame 102, which will be described later, may also be accommodated in the first frame 101.

As described above, the display unit 151 has the continuous body, and thus, may be disposed on both the front face and the rear face of the mobile terminal 100 while being rolled in the mobile terminal 100. The display unit 151 may include the front face positioned at the front face of the mobile terminal 100, the rear face positioned at the rear face of the mobile terminal 100, and the side face positioned between the front face and the rear face thereof and surrounding the side face of the mobile terminal. The front face and the rear face of the display unit 151 are flat, and the side face of the display unit 151 may form a curved face. When the flexible display unit 151 may be damaged when being bent. Thus, the flexible display unit 151 may be formed to be bent with a predetermined curvature.

The display unit 151 may be divided into a fixed portion and a variable portion. The fixed portion means a portion fixed to the frame. Because of being fixed to the frame, the fixed portion maintains a constant shape without changing a bending degree. On the other hand, the variable portion means a portion in which a bending angle or a position of the bent portion changes. The variable portion in which the position or bending angle of the bent portion changes requires a structure for supporting a rear face of the variable portion in response to the change.

The fixed portion is coupled to the first frame of the display unit and is always positioned on the front face of the display unit to form a portion of the front face of the display unit. The variable portion includes a side face located at a side portion of the mobile terminal, and a position of the side face varies depending on the position of the second frame. Based on a side face, an area of a portion disposed on the front face of the display unit and an area of a portion disposed on the rear face of the display unit vary. That is, a portion of the variable portion may be the front face and another portion of the variable portion may be the rear face based on the first and second states. The variable portion is positioned in the first direction with respect to the fixed portion relative to the mobile terminal, and an end of the variable portion is bent toward the rear face of the mobile terminal and slides on the rear face of the second frame.

The end of the variable portion of the display unit is coupled with a slide frame that guides the variable portion to slide move on the rear face of the second frame, and the slide frame moves in the first direction at the same time as the second frame moves in the first direction. As a result, a moving distance of the slide frame with respect to the first frame is twice as a moving distance of the second frame with respect to the first frame. Further, as shown in FIG. 4, the first rear portion 1012 of the mobile terminal 100 includes an exposed rear portion 1013 that is exposed to the outside without being covered by the display unit 151 even in the first state. The physical input unit 120 for the manipulation of the mobile terminal 100 such as various buttons, switches, the camera 121, and a flash, and the sensing unit 140 such as the proximity sensor 141 or a fingerprint sensor may be arranged on the exposed rear portion 1013. The first rear portion 1012 except for the exposed rear portion 1013 may be covered by the display unit 151 in the first state as shown in FIG. 4A, and may be exposed rearwardly in the second state as shown in FIG. 4B.

In a conventional bar-shaped terminal, a display unit is provided only on a front face of the terminal. Therefore, a main camera is placed on a rear face of the terminal in order for the user to capture an object at an opposite side while looking through the display unit. On the other hand, an additional auxiliary camera is required to be disposed on the front face of the terminal in order for the user to capture himself or herself while viewing himself or herself through the display unit.

However, the display unit 151 is positioned both the front face and the rear face of the mobile terminal 100 of the present disclosure. Therefore, when the user captures himself or herself, a display unit on the same face as the camera 121, that is, the portion of the display 151 on the rear face of the mobile terminal 100 in the drawing may be used. Further, when the user captures the object on the opposite side of the user, a display unit on the opposite face of the camera 121, that is, the portion of the display unit 151 on the front face of the mobile terminal 100 in the drawing may be used. For this reason, the mobile terminal 100 may capture the object on the opposite side of the user and capture the user using the single camera 121. The camera may include a plurality of cameras having different angles of view, such as wide angle, super wide angle, and telephotographic cameras. In addition to the camera, a proximity sensor, the audio output module, and the like may be positioned on the exposed rear portion 1013, and an antenna 116 may be installed on the exposed rear portion 1013. In order to protect the camera, the sensor, and the like of the exposed rear portion 1013 and in consideration of a design of an outer shape thereof, an exposed decor 1013 may be attached on the exposed rear portion 1013.

The side portion 1014 may extend along edges of the first front portion 1011 and the first rear portion 1012 to surround the first frame 101, and may form the outer shape of the mobile terminal 100. However, as mentioned above, since the second frame 102 is accommodated in the first frame 101 and is movably coupled thereto, in order to allow the movement of the second frame 102 relative to the first frame 101, a portion of the first frame 101 needs to be opened. As shown in FIG. 2, as an example, the second frame 102 is movably coupled to one of both side portions of the first frame 101, so that the side portion 1014 may not be formed on the side portion in the first direction, and thus, the portion of the first frame 101 may be opened. Accordingly, the first frame 101 may include a substantially closed first side portion 101 a and a second side portion 101 b, which is disposed to be opposite to the first side portion 101 a and is opened. The side portion 1014 is exposed to the outside of the mobile terminal 100, so that an interface unit 160 for connecting a supply port or an ear jack, the user input unit 120 such as a volume button, or the like may be disposed on the side portion 1014. When containing a metal material, the side portion 1014 may serve as an antenna.

The second frame 102 may include a second front portion 1021 disposed at the front portion of the mobile terminal 100 and a second rear portion 1022 disposed at the rear portion of the mobile terminal 100. Like the first front portion 1011 and the first rear portion 1012 of the first frame 101, the second front portion 1021 and the second rear portion 1022 may be formed of plate-shaped members that are generally flat. In addition, the second frame 102 also accommodates various components, and must not interfere with the components accommodated in the first frame 101 during the movement. Accordingly, the second front portion 1021 and the second rear portion 1022 may be coupled to each other in a state of being spaced apart from each other to define a predetermined space therebetween, and may have shapes that do not interfere with the components in the first frame 101.

In addition, the display unit 151 may be bent 180 degrees while being rolled in the second frame 102 to be disposed on both the front face and the rear face of the mobile terminal 100. For such an arrangement of the display unit 151, the second frame 102 may include a roller 1028 rotatably disposed therein. The roller 1028 may be disposed at any position inside the second frame 102. However, the display unit 151 should be spread flat on the front face and the rear face of the mobile terminal 100 to provide a good quality screen to the user. Further, for such spread, a proper tension must be provided on the display unit 151. In order to provide the proper tension, the roller 1028 may be disposed at a first directional end of the second frame 102. The roller 1028 may extend in the third direction, and may be rotatably coupled to the second frame 102.

The display unit 151 may be rolled around the roller 1028 while being gently bent with a predetermined curvature. The flexible display unit 151 may include a first face on which a video is output and exposed to the outside and an inner face facing the frame at the opposite side. The roller 1028 may be installed to rotate freely in the second frame 102 while being in contact with the inner face of the display unit 151. Accordingly, the roller 1028 may actually move the display unit 151 in a lateral direction of the mobile terminal 100, that is, in a direction perpendicular to a longitudinal direction. As will be described later, when the second frame 102 slides, because of the tension applied by the second frame 102, the display unit 151 moves to the front face or the rear face of the mobile terminal 100 in different directions (i.e., the first direction D1 or the second direction D2) relative to the second frame 102. The roller 1028 may guide such movement while rotating.

In addition, the roller 1028 is disposed on a first side portion 102 a of the second frame 102, and the first side portion 102 a actually corresponds to an outermost side portion of the mobile terminal 100. When the first side portion 102 a of the second frame 102 is exposed, the display unit 151 rolled on the roller 1028 may be damaged. Accordingly, the second frame 102 may include a side frame 1024 disposed on the first side portion 102 a.

The side frame 1024 extends in the longitudinal direction of the second frame 102 to cover the first side portion 102 a, thereby protecting the roller 1028 and the display unit 151 rolled thereon.

Because the side face is rolled by the roller, the side face is bent with the predetermined curvature, and an inner face of the side frame may include a curved face corresponding to the curvature of the side face.

Because of the side frame 1024, the second frame 102 may have the substantially closed first side portion 102 a, and the side frame 1024 may substantially form the outer shape of the mobile terminal 100 together with the side portion 1014 of the first frame 101. In addition, the second frame 102 may include a second side portion 102 b that is disposed opposite the first side portion 102 a to minimize interference with the components within the first frame 101 during the movement, and is opened.

Such a second frame 102 is movably coupled to the first frame 101, and thus may slide in the predetermined first or second direction D1 or D2 relative to the first frame 101. More specifically, the second frame 102 may be movably coupled to the first frame 101 through the side portion of the first frame 101, more precisely, through the opened second side portion 101 b, as shown. More specifically, the second side portion 102 b of the second frame is disposed relatively adjacent to the first side portion 101 a of the first frame 101 which is closed. Accordingly, the first side portion 102 a of the second frame may be disposed to be opposite to the first side portion 101 a. Accordingly, the second side portion 102 b is inserted into the first frame 101 through the side portion of the first frame, that is, the second side portion 101 b thereof. The first side portion 102 a is not inserted into the first frame 101 but is always located outside the first frame 101, thereby forming the outer shape of the mobile terminal 100 as described above. However, when necessary, such first side portion 102 b of the second frame 102 may also be inserted into the first frame 101.

Because of such positional relationship, the second frame 102 may extend from or contract to the first frame 101 in a direction perpendicular to the longitudinal direction of the mobile terminal 100 or the first frame 101. That is, the first and second directions D1 and D2 may basically be directions perpendicular to the longitudinal direction of the mobile terminal 100 or the first frame 101. Further, the first and second directions D1 and D2 may also be described as the lateral direction or the horizontal direction of the mobile terminal 100 or the first frame 101. In addition, during the movement in the first direction D1, the second frame 102 extends from the first frame 101. Accordingly, the first direction D1 may be a direction in which the second frame 102 moves away from the first frame 101, that is, moves outwardly of the mobile terminal 100 or the first frame 101. On the other hand, during the movement in the second direction D2, the second frame 102 contracts to the first frame 101. Thus, the second direction D2 is a direction opposite to the first direction D1, so that the second direction D2 may be a direction in which the second frame 102 moves to become closer to the first frame 101, that is, moves inwardly of the mobile terminal 100 or the first frame 101. When being moved in the first direction D1, such second frame 102 extends and applies a force to the portion of the display unit 151 disposed on the rear face of the mobile terminal 100, so that the portion of the display unit 151 may be disposed on the front face of the mobile terminal 100, and a region for such additional arrangement may be defined. Thus, the second frame 102 may convert the mobile terminal 100 into the second state with the display unit 151 with the relatively extended front face by moving in the first direction D1. On the other hand, when being moved in the second direction D2, the second frame 102 contracts into an original state thereof, and applies a force to the portion of the display unit 151 disposed on the front face of the mobile terminal 100 to return to the rear face of the mobile terminal 100 again. Thus, the second frame 102 may convert the mobile terminal 100 into the first state with the display unit 151 with the relatively contracted front face by moving in the second direction D2. Accordingly, the second frame 102 selectively exposes the display unit 151 to the front face of the mobile terminal 100 depending on the moving direction (i.e., the first or second direction D1 and D2). Accordingly, the mobile terminal 100 may be converted into the first or second state defined above.

During the expansion and the contraction in such first and second directions D1 and D2, the second frame 102 may overlap the first frame 101, more precisely, the first front portion 1011 and the first rear portion 1012 thereof so as not to interfere with the first frame 101. More specifically, the display unit 151 may be coupled to and supported by the first front portion 1011 of the first frame 101, as described above. Accordingly, the display unit 151 does not need to be additionally supported by the second front portion 1021 of the second frame 102. Rather, when the second front portion 1021 is interposed between the first front portion 1011 and the display unit 151, the display unit 151 may be deformed or damaged because of friction with the second front portion 1021, which is repeatedly moved. Thus, the second front portion 1021 may be disposed below the first front portion 1011, or may be interposed between two first front portions 1011. The second rear portion 1022 of the second frame 102 may be disposed rearward of the first rear portion 1012 of the first frame 101. That is, the front face of the second rear portion 1022 may face the rear face of the first rear portion 1012. In addition, the rear face of the first rear portion 1012 may be in contact with the front face of the second rear portion 1022 to stably support the movement of the second frame 102. Because of such arrangement, the second rear portion 1022 may be exposed to the outside of the first frame, more precisely, of the first rear portion 1012, and may be coupled to the display unit 151.

In addition, the second frame 102 may extend and contract the size of the mobile terminal 100 itself, particularly the front face of the mobile terminal 100 by the extension and the contraction in the first and second directions D1 and D2. Thus, the display unit 151 must move by such extended or reduced front face size to obtain the intended first and second states. However, when being fixed to the second frame 102, the display unit 151 may not be moved smoothly to be adapted for the front face of the mobile terminal 100 that is extended or contracted. For this reason, the display unit 151 may be movably coupled to the second frame 102.

More specifically, the display unit 151 may include a first side edge (or side end) 151 d disposed on the front face of the mobile terminal 100 and a second side edge 151 e opposite to the first side edge 151 d and disposed on the rear face of the mobile terminal 100. The first side edge 151 may be disposed on the front face of the first frame 101, that is, the front face of the first front portion 1011 thereof, and may be disposed adjacent to the side portion of the mobile terminal 100, that is, the first side portion 101 a of the first frame. On the other hand, since the second side edge 151 e is adjacent to the rear face of the mobile terminal 100 and the second rear portion 1022 of the second frame 102, the second side edge 151 e may is be coupled the second rear portion 1022 of the second frame 102 to be movable in the first and second directions D1 and D2. In addition, since the display unit 151 is not structurally strong, a slide frame 103 may be coupled to the second side edge 151 e. The slide frame 103 may be formed of a plate-shaped member extending in the longitudinal direction of the mobile terminal 100.

Accordingly, the second frame 103 may be coupled to the second frame, that is, the second rear portion 1022 thereof to be movable in the first and second directions D1 and D2 instead of the second side edge 151 e. In addition, the second frame 102 may include a slot 1025 extending in the lateral direction of the mobile terminal 100 or the second frame 102, that is, the direction perpendicular to the longitudinal direction thereof. Further, the slide frame 103 may be stably moved while being guided by the slot 1025. The slide frame 103 may include, for example, a projection inserted into the slot 1025 for the movement along the slot 1025.

Referring to FIGS. 3 to 5, in connection with such configuration of the first to third frames 101, 102, and 103, the display unit 151 may include a first region 151 a extending from one side thereof, that is, the first side edge 151 d toward the opposite second side edge 151 e by a predetermined length, and a second region 151 b disposed opposite the first region 151 a, and extending from the second side edge 151 e toward the first side edge 151 d by a predetermined length. In addition, the display unit 151 may include a third region 151 c disposed between the first and second regions 151 a and 15 lb. Such first to third regions 151 a, 151 b, and 151 c may be connected to each other, and may form a continuous body of the display unit 151. In addition, as described above, for the movement of the third region 151 c toward the front face or the rear face of the mobile terminal 100 depending on the moving direction of the second frame 102, the first region 151 a may be fixed so as not to move to the front face of the mobile terminal 100, and the second region 151 b may be provided to be movable on the rear face of the mobile terminal. Such configuration of the display unit 151 will be described in more detail below.

The first region 151 a may be disposed on the front face of the mobile terminal 100, more specifically, the first frame 101, that is, on the front face of the first front portion 1011. The first region 151 a is fixed to the first frame 101, that is, the front face of the first front portion 1011 so as not to be moved during the movement of the second frame 102, and thus, the first region 1511 may always be exposed to the front face of the mobile terminal 100.

The third region 151 c may be adjacent to the first region 151 a in a direction of the second side edge 151 e, and may extend into the second frame 102 and rolled on the roller 1028. The third region 151 c may consecutively extend out of the second frame 102 again and partially cover the second frame 102, that is, the rear face of the second rear portion 1022. Further, the second frame 102, that is, the second rear portion 1022, is adjacent to the first frame 101, that is, the first rear portion 1012 and together forms the rear case of the mobile terminal 100, so that it may be described that the third region 151 c is also disposed on the rear face of the first frame 101.

The second region 151 b may be adjacent to the third region 151 c in the direction of the second side edge 151 e and may be disposed on the rear face of the mobile terminal 100, more specifically, on the second frame, that is, the rear face of the second rear portion 1022 thereof. The second region 151 b may be coupled to the slide frame 103 without being directly coupled to the second frame 102. As shown in FIG. 4B, the slot 1025 extending in the lateral direction (i.e., the direction perpendicular to the longitudinal direction of the mobile terminal 100) to the second frame 102, that is, to the second rear portion 1022 is defined. Further, the slide frame 103 may move along the slot 1025. In FIG. 4B, it is shown that the slot 1025 is defined in the rear face of the second frame 102, but may be defined in the side face of the second frame 102.

Although the second region 151 b may move in the first or second direction D1 or D2 with respect to the second frame 102 together with the slide frame 103, the movement of the second region 1512 may be restricted within the rear face of the mobile terminal 100 by the slot 1025. That is, the second region 1512 does not move out of the second frame 102 even when the second frame 102 is extended or contracted, and may move along the slot 1025 within the second frame 102 by the extended or contracted distance of the second frame 102. Accordingly, the second region 1512 may always be exposed to the rear face of the mobile terminal 100.

As a result, the first region 151 a may be disposed on the front face of the mobile terminal 100 and may be always exposed to the front face regardless of the movement of the second frame 102, and the second region 151 b may be disposed on the rear face of the mobile terminal 100 and may be always exposed to the rear face regardless of the movement of the second frame 102. In addition, the third region 151 c may be disposed between the first and second regions 151 a and 151 b, and may be selectively placed on the front face or the rear face of the mobile terminal 100 depending on the moving directions D1 and D2 of the second frame 102.

Because of such selective placement of the third region 151 c, as shown in FIG. 4B, the first rear portion 1012 of the first frame 101 may be exposed to the outside of the mobile terminal 100 because the first rear portion 1012 is covered by the second and third regions 151 b and 151 c and the second rear portion 1022 of the display unit 151 in the first state, but, in the second state, the third region 151 c moves to the front face of the mobile terminal 100 and the second rear portion 1022 also moves in the first direction Dl. In addition, the second front portion 1021 of the second frame 102 is hidden by the first front portion 1011 of the first frame 101 in the first state, but, in the second state, moves out of the first frame 101 to support the third region 151 c of the display unit 151 disposed on the front face of the mobile terminal 100.

In order to prevent the second front portion 1021 from affecting the internal components during the slide movement, a separating plate 1017 may be further disposed rearward of the second front portion 1021 and fastened with the first front portion 1011. The second front portion 1021 may move between the first front portion 1011 and the separating plate 1017 based on the slide movement of the second frame.

However, the third region 151 c may be rolled on the roller 1028 and bent in the second frame 102. When converting from the first state to the second state, the third region 151 c may extend from the second frame 102 to the front face of the mobile terminal 100 while being rolled on the roller 1028 in one direction. On the other hand, when converting from the second state to the first state, the third region 151 c may be retracted from the front face of the mobile terminal 100 to the second frame 102 while being rolled on the roller 1028 in the opposite direction, and at the same time, may return to the rear face of the mobile terminal 100 from the second frame 102.

A specific location of the foldable mobile terminal in a form of being spread like a book is easily damaged because only the specific location is folded repeatedly. On the other hand, the deformed portion of the flexible display unit 151, that is, a portion rolled on the roller 1028, may vary based on the first and second states of the mobile terminal 100, that is, the movement of the second frame 102. Accordingly, the mobile terminal 100 of the present disclosure may significantly reduce deformation and fatigue repeatedly applied to a specific portion of the display unit 151, thereby preventing damage to the display unit 151.

Based on the above-described configuration, overall operations of the mobile terminal 100 will be described as follows. As an example, the state conversion may be performed manually by the user, and an operation of the mobile terminal 100 during such manual state conversion will be described. However, operations of the first to third frames 101 to 103 and the display unit 151, which will be described below, may be performed in the same manner when a power source other than a user's force is used, for example, when the driving unit 200 to be described below is applied.

A rear face cover 1023 may be further disposed on a rear face of the second rear portion 1022 such that the rear face of the display unit positioned on the rear face of the mobile terminal 100 is not exposed to the outside. The rear face of the display unit may be used in the first state when the rear face cover 1023 uses a transparent material, and the rear face of the display unit may be covered such that the movement of the slide frame 103 is not exposed when the rear face cover 1023 uses an opaque material. That is, the second region and the third region of the slide frame 103 and the display unit 151 may move in the first direction and in the second direction in a space between the second rear portion 1022 and the rear face cover 1023. The exposed decor 1013 may be further attached to the exposed rear portion of the first rear portion 1012 to protect the camera 121, the sensor 140, and the like. The exposed decor 1013 may be partially coated on a plate-shaped member made of a transparent glass material to cover the internal components, and may be not coated only on a required portion to allow light to reach the camera 121, the flash or the sensing unit 140, and the like.

It is difficult to connect the side frame 1024, which is located on a side face in the first direction on which the second frame 102 is located, with an interior of the mobile terminal directly, so that it is difficult to dispose an user input unit. Accordingly, a user input unit 123 such as a volume button may be disposed on a side face adjacent the first frame 101 in the second direction.

FIG. 6 is a diagram illustrating various embodiments of the side frame 1024 of the roll-slide mobile terminal 100 associated with the present disclosure. Further, FIG. 7 illustrates cross-sectional views respectively taken along a line E-E, a line F-F, and a line G-G of FIG. 6. The side frame 1024 may contain an opaque material or a transparent material, or may be formed by mixing the opaque material and the transparent material with each other. As shown in FIG. 6A, a transparent portion 1024 b may be formed in a middle of an opaque portion 1024 a in a form of a window, or the transparent portion 1024 b may be formed to have a wide area as shown in FIG. 6B. An image or text output through the flexible display unit 151 may be viewed through the transparent portion 1024 b.

User input may be performed on the side face using the touch sensor of the flexible display unit 151. A side case may contain a conductive material for the touch input. A protrusion may be formed on a portion containing the conductive material, so that the user may touch the protrusion to input a user command.

An inner face of the side frame 1024 corresponding to a curvature of the flexible display unit 151 rolled on the roller 1028 may have a middle portion that is formed more thicker as shown in FIG. 6, so that the side frame 1024 may secure rigidity while having a natural curved face.

In addition, as shown in FIG. 6C, the transparent portion 1024 b of a predetermined pattern may be formed to drive the flexible display unit 151, thereby providing a notification to the user. For example, when there is a phone call, the flexible display unit 151 may be driven to sequentially emit light.

Alternatively, when there is a notification push of a message or application, the flexible display unit 151 rolled on the roller 1028 may provide the notification by emitting light of a specific color. Therefore, the user may receive the notification using the flexible display unit 151 without the separate optical output module 154. In this connection, light may spread softly on the transparent portion 1024 b using a translucent material rather than the transparent material.

As shown in FIG. 6D, a width of an area of the side frame 1024 in a thickness direction may be reduced to implement a terminal having an edge region extending from an end of the display unit to a portion in a side direction.

The side frame 1024 may prevent a breakage that occurs when the bent face of the flexible display unit 151 is exposed to the outside using an out-folding scheme, so that a durability of the roll-slide mobile terminal 100 may be improved.

FIG. 7 illustrates a configuration of the roller 1028 and the flexible display unit 151 as well as the side frame 1024. The flexible display unit 151 of the present disclosure may include a display panel 151 b for outputting the video and a back plate 151 c for supporting a rear face of the display panel 151 b.

The display panel 151 b, which is a flexible video display device, may be, for example, an organic light emitting diode (OLED). The back plate 151 c may be formed on the rear face of the display panel 151 b, and may use a metal plate that has a rigidity to support the display panel 151 b and is able to be bent when the display panel 151 b is bent.

The back plate 151 c and the display panel 151 b may be attached with each other using an adhering member. The adhering member may use a double-sided tape such as OCA, which is stretchable within a predetermined range, such as a foam material. Therefore, the adhering member may offset pushing between the back plate 151 c and the display panel 151 b due to a difference in radius of curvature therebetween.

A region of the back plate 151 c corresponding to the third region may have a groove defined in a surface thereof extending in the third direction such that the bending occurs naturally during the bending deflection of the third region.

The back plate 151 c has the rigidity but areas of the display panel 151 b other than the supported end thereof may sag, so that a support frame 1515 located in an area corresponding to the third region 151 c may be further disposed to support the areas of the display panel 151 b other than the supported end.

The support frame 1515 may include a plurality of rigid bars 1515 a in a form of a bar extending in the third direction, which are consecutively arranged in the first direction. Since a width thereof in the first direction is not large, the rigid bar 1515 a may be formed in a thickness to have a predetermined rigidity while minimizing an effect on the bending deflection of the flexible display unit 151 to support the rear face of the flexible display unit 151. The rigid bar 1515 a may have a trapezoidal or triangular cross section such that an area of a portion adhere to the back plate 151 c is larger than an area of an opposite face in order to avoid interference between the rigid bars 1515 a especially when the back plate 151 c is bent.

The rigid bar 1515 a may be formed using a plastic injection-molding scheme, and when necessary, as shown in FIG. 6B, a metal member 1515 b may be inserted inside the rigid bar 1515 a to reinforce the rigidity of the support frame 1515.

The support frame 1515 may have a thickness corresponding to a thickness of the first front portion 1011 of the first frame 101. As shown in FIG. 4, in the conversion from the first state into the second state, the second front portion 1021 positioned inside the first front portion 1011 is positioned on the rear face of the second region 151 b of the flexible display unit 151. A space having a size corresponding to a thickness of the first front portion 1011 is defined between the second front portion 1021 and the back plate 151 c, so that the third region 1513 of the flexible display unit 151 sags.

The support frame 1515 supports the third region 151 c of the flexible display unit 151 while filling the space between the second front portion 1021 and the back plate 151 c. Preferably, the support frame 1515 may have a thickness corresponding to the space between the second front portion 1021 and the back plate 151 c, that is, the thickness of the first front portion 1011.

When the support frame 1515 has sufficient rigidity, the second front portion 1021 of the second frame 102 may be omitted. In this case, the thickness of the support frame 1515 may be defined regardless of the first front portion 1011 of the first frame.

The roller 1028 is in contact with a rear face of the support frame 1515. Further, in order for the flexible display unit 151 to be rolled on the roller 1028 without being pushed, a first tooth 1028 a may be formed on a surface of the roller 1028 as shown in FIG. 7C, and a second tooth 1515 c to be engaged with the first tooth 1028 a may be formed on a surface of the support frame 1515. Alternatively, as shown in FIG. 7B, the first tooth 1028 a may have a width corresponding to a spacing between two adjacent rigid bars 1515 a. The roller 1028 may rotate in a state in which each protrusion 1028 a is inserted between the two adjacent rigid bars 1515 a.

In addition, as shown in FIG. 7, a rear face cover 104 for covering the rear face of the roll-slide mobile terminal 100 may be further included. At least a portion of the rear face cover 104 is transparent, so that video output from the flexible display unit 151 positioned at the rear face may be identified. At least a portion for covering the first rear portion 1012 corresponding to the camera 121, the flash, or the like may be formed to be transparent.

The rear face cover 104 may be coupled to the first frame 101 to cover the first rear portion 1012, and may be spaced apart from the second rear portion 1022 by a spacing corresponding to thicknesses of the second rear portion 1022 of the second frame 102, the slide frame 103, and the flexible display unit 151. The rear face cover 104 may cover the flexible display unit 151 when the roll-slide mobile terminal 100 is in the first state, and may cover the first rear portion 1012 exposed after the flexible display unit 151 is moved forwardly in the second state.

The rear face cover 104 may be coupled to the second frame 102. In this case, the rear face cover 104 may cover an entirety of the rear face of the roll-slide mobile terminal 100 in the first state, but may move together with the second frame 102 to cover the second region 151 b of the flexible display unit 151 coupled to the second rear portion 1022 of the second frame 102 and the slide frame 103 in the second state. FIGS. 8 to 9 are diagrams illustrating an assembly sequence of a mobile terminal. FIG. 8 is a view illustrating a method for coupling the second rear portion 1022 of the second frame 102, the display unit 151, and the slide frame 103 with each other. In the second frame 102, the slide frame 103 is coupled to the rear face of the second rear portion 1022 positioned at the rear face, and the slide frame 103 moves along the rear face of the second rear portion 1022. FIG. 8A illustrates the rear face of the second rear portion 1022 and the rear face of the display unit 151.

The first side edge 151 d of the display unit 151 is a portion fixed to the first frame 101. As shown in FIG. 3, a portion where the front face and the side face of the display unit 151 are connected with each other is rolled on the roller 1028 and forms a curved face. Further, the portion of the first side edge 151 d of the display unit 151 opposite to the portion where the front face and the side face of the display unit 151 are connected with each other in the second direction may also formed to have a curved face, so that left and right portions of the front face may be symmetrical.

When the curved face is located at the end of the display unit 151, the screen may look wide, but the display unit 151 receives a force as the second frame 102 moves, and the region of the front face of the display unit 151 varies. Since the force is applied to the first region of the display unit 151 when the second frame 102 and the slide frame 103 are moved, a structure that strongly supports the first region is required. As shown in FIG. 5, a curved face bracket 1016 may be coupled to the first side edge 151 d of the display unit 151 to be against the force applied to the display unit 151 when converting from the first state to the second state.

FIG. 8(a) illustrates a state in which the curved face bracket 1016 is coupled to a rear face of the first side edge 151 d of the display unit 151. The first side edge 151 d of the display unit 151 may be pressed using a jig in a pressing scheme to attach the first side edge 151 d of the display unit 151 to the curved face bracket 1016. The second side edge 151 e of the display unit 151 may be coupled to the slide frame 103, and the slide frame 103 may be fastened to the second rear portion 1022 of the second frame 102 and move in the first direction and the second direction. A display flexible substrate 1518 connecting the display unit 151 and a main board 181 with each other may be located on the rear face of the display unit 151.

A portion of the display unit 151 near the second side edge 151 e may be rolled on the roller 1028 and positioned on the rear face of the second rear portion 1022, and the other portion thereof may be disposed forwardly of the second rear portion 1022 as shown in FIG. 8B such that the slide frame 103 is positioned on the rear face of the second rear portion 1022.

The rear face of the second rear portion 1022 may be mounted to face a bottom, and the display unit 151 may be disposed as shown in FIG. 9A such that a portion rolled on the roller 1028 forms 90 degrees. Then, the battery 191, the driving unit 200, the camera 121, the main board 181, and the like may be mounted on the first rear portion 1012 of the first frame 101, and then the first rear portion 1012 may be mounted on the second rear portion 1022 as shown in FIG. 9B. The first rear portion 1012 may be disposed on the front face of the second rear portion 1022 to overlap the second rear portion 1022. Further, a rack gear 204 to be engaged with a motor 201 and a pinion gear 203 mounted on the first rear portion 1012 may be fastened to the front face of the second rear portion 1022. As shown in FIG. 9B, the first rear portion 1012 and the second rear portion 1022 may be arranged in a shape corresponding to the second state. In this connection, the first region and the third region of the display unit 151 may extend in the vertical direction as shown in FIG. 9A, and may expose the front faces of the first rear portion 1012 and the second rear portion 1022 as shown in FIG. 9B.

As shown in FIG. 10, the display flexible substrate 1518 may be connected to a front face of the main board mounted on the first rear portion 1012. One end of the display flexible substrate 1518 may extend from an end, that is, a second end of the second region, be rolled on the roller 1028, and then be bent forwardly to be connected to the main board. As shown in FIG. 10B, the second front portion 1021 may be disposed on the front face of the first rear portion 1012 and fastened to a guide rail 231. Thereafter, as shown in FIG. 11A, the second front portion 1021 may be slid to the front face of the second rear portion 1022 to engage the second rear portion 1022 and the second front portion 1021 with each other.

The separating plate may be further disposed on the rear face of the second front portion 1021 to separate the electronic components mounted on the second front portion 1021 from the electronic components mounted on the first rear portion 1012. Since the separating plate is located rearward of the first front portion 1011 as shown in FIG. 11A, after fastening the separating plate with the first rear portion 1012, the guide rail 231 of the second front portion 1021 may be inserted into a guide block 232 in a slide scheme. Thereafter, as shown in FIG. 11B, when the first front portion 1011 is fastened with the first rear portion 1012, the second front portion 1021 is moved between the first front portion 1011 and the separating plate. The first front portion 1011 is where the first region of the display unit 151 is located as will be described below, and the second front portion 1021 has a region directly facing the display unit 151 in the second state as shown in FIG. 11B.

Next, as shown in FIG. 12, the first end of the display unit 151 is inserted into a first side portion 101 a of the first frame 101. The curved face bracket 1016 coupled to the first end of the display unit 151 is fastened with the first rear portion 1012 of the first frame 101. In order to stably fix the first side edge 151 d of the display unit 151 and protect the curved portion, a display decor 1016 may be fitted to abut an outer face of the first side edge 151 d of the display unit 151.

In the display of the present disclosure, the portion rolled on the roller 1028 and bent is not simply bent, but moves sequentially. To this end, as the second frame 102 moves, a force may be applied to the display unit 151. Since a force pulled by the driving unit 200 is greatly applied to the bent portion, the portion rolled on the roller 1028 or the curved portion of the first end of the display unit 151 is fragile. The curved portion of the first end may be reinforced by a structure fixed at the rear face and the front face such that the force by the driving unit 200 may be dispersed without being concentrated in one place.

The third region rolled on the roller 1028 bends, and when it is converted into the second state, moves from the rear face to the front face. Since the second front portion 1021 of the second frame 102 is positioned on the extended front face and the second front portion 1021 is spaced apart from the display unit 151 farther than the first front portion 1011. the third region may add the support frame 1515 having a thickness corresponding to a thickness of the first front portion 1011 to the rear face. As shown in FIG. 12C, a groove 1515′ extending in the third direction may be formed in the rear face of the support frame 1515 such that the support frame 1515 bends corresponding to the deformation of the display unit 151. When a width g of the groove 1515′ is small, a bending deflection of the support frame 1515 does not occur in correspondence to the bending deflection of the display unit 151, and thus a stress may be applied to the display unit 151. Therefore, it is necessary to ensure the sufficient width g of the groove 1515′ extending in the third direction formed in the support frame 1515 such that the support frame 1515 may bend naturally in correspondence with the bending deflection of the third region.

FIG. 13 is a diagram for describing an operation of a driving unit according to one embodiment of the roll-slide mobile terminal 100 associated with the present disclosure.

When the user extends the flexible display unit 151 by holding and pulling the second frame 102, the flexible display unit 151 may be distorted or the first frame 101 or the second frame 102 may be damaged. Therefore, the driving unit 210 may be used to convert the state from the first state to the second state or vice versa.

The driving unit 210 slides the second frame 102 in the first direction relative to the first frame 101, and simultaneously slides the slide frame 103 in the first direction relative to the second frame 102.

When the state is converted from the first state to the second state, when the second frame 102 moves by a first distance d, the flexible display unit 151 moves by a second distance 2 d corresponding to twice the first distance. In order for the end of the flexible display unit 151 to move by the second distance, the slide frame 103 must also move the same distance as the second frame 102 from the second frame 102.

Accordingly, the driving unit 210 may use a linear motor 210 that operates linearly to compensate for such deformation. The linear motor 210 may include a first bracket 211 fixed to a first body, a second bracket 212 that slides in the first direction with respect to the first bracket 211, and a third bracket 213 that slides in the first direction with respect to second bracket 212. Since a length of the contracted driving unit 210 cannot be wider than a width in the third direction of the first frame 101, so that the linear motor 210 may be configured in at least three stages.

The driving unit 210 mounted inside the first frame 101 should be fastened with the slide frame 103 positioned on the rear face of the second rear portion 1022 of the second frame 102. Therefore, a fastener for fastening the third bracket 213 with the slide frame 103 is disposed by passing through the slide slot 1025 defined in the second frame 102. The fastener moves the slide frame 103 while moving along the slide slot 1025 in the first direction, and the third region 151 c of the flexible display unit 151 sequentially moves forwardly.

FIG. 14 is a diagram illustrating an embodiment of the driving unit 200 of a mobile terminal. Referring to FIG. 10, the driving unit 200 may be disposed at an upper portion without being positioned at a central portion. A space having a large area is required to arrange the components such as the battery. When the driving unit 200 is placed in the central portion, it is difficult to mount the battery. As shown in FIG. 10A, the driving unit 200 may be disposed to be positionally biased in the third direction, and instead, a pair of linear guides 230 for guiding the movement of the second frame 102 in the first direction or the second direction may be further arranged at both ends of the mobile terminal in the third direction, respectively.

Referring to FIG. 14, a plurality of motors 201 may be arranged to apply sufficient driving force to move the second frame 102. As a size thereof is large, the motor 201 may provide a larger force, but a thickness of the mobile terminal may also become large. Therefore, as shown in FIG. 14B, both ends in a thickness direction of the motor are formed in a cut shape to reduce the thickness while ensuring performance. A rotational force of the motor 201 may be directly transmitted to the pinion gear 203 of the rack-pinion gears 203 and 204 for moving the second frame 102 in the first direction, but as shown in FIG. 13A, a planetary gear 202 may be further disposed between the pinion gear 203 and the motor 201.

In the planetary gear 202 transmitting the force of the motor 201, a plurality of disc gears are engaged with each other. The number of revolutions of the pinion gear 203 relative to the number of revolutions of the motor 201 may be adjusted by adjusting a size of the planetary gear 202 and the number of teeth. The planetary gear 202 may be used to effectively transmit the rotational force of the motor 201 to the pinion gear 203.

FIG. 15 shows cross-sectional views respectively taken along a line C-C and a line D-D of FIG. 3, which are cross-sectional views of the rack-pinion gear portion. FIG. 15A shows the first state, and FIG. 15B shows the second state. In the first state, the first frame 101 and the second frame 102 are kept in an overlapped state. When the motor 201 of the driving unit 200 is operated and the pinion gear 203 is revolved (counterclockwise in the drawing), the rack gear 204 moves in a rightward direction as shown in FIG. 15B. The pinion gear 203 is fixed to first frame 101, and the rack gear 204 is fixed to the second frame 102. Although the rack gear 204 is illustrated as being positioned in the second rear portion 1022 of the second frame 102 in the drawings, the rack gear 204 may be coupled to the second front portion 1021.

When the second frame 102 and the rack gear 204 move in the first direction as shown in FIG. 15B, the third region of the display unit 151 moves in a forward direction, the slide frame 103 moves in the first direction from the rear face of the second rear portion 1022 of the second frame 102, and the area of the portion of the display unit 151 located at the rear face of the mobile terminal is reduced.

FIGS. 16 to 18 illustrate various embodiments of the linear guide 230 of the mobile terminal. As described above, the pair of linear guides 230 of the present disclosure may be disposed at the both ends of the mobile terminal in the third direction, that is, an upper end and a lower end thereof, to complement the function of the single driving unit 200 positionally biased to one side. The linear guide 230 may include the guide rail 231 extending in the first direction and the guide block 232 moving along the guide rail 231. The guide rail 231 may be disposed in the first frame 101 and the guide block 232 may be disposed in the second frame 102 and vice versa. In the present embodiment, the guide rail 231 may be disposed in the second frame 102 to cover upper and lower portions of the extended portion of the second frame 102 in the second state.

After the guide block 232 is coupled to the first frame 101 and the guide rail 231 is coupled to the second frame 102, the guide block 232 and the guide rail 231 may be slide-fastened with each other. However, for convenience of the fastening, the guide block 232 may be first fixed to the first frame 101 while the guide block 232 and the guide rail 231 are fastened with each other, and then the second frame 102 and the guide rail 231 may be fixed with each other using a screw 2313. Accordingly, as illustrated in FIG. 16, a plurality of screw holes 2312 may be defined in a portion of the guide rail 231 to be coupled to the second frame 102.

The guide block 232 may include a guide groove 2321 defined therein into which the guide rail 231 is inserted. Further, the guide groove 2321 and an insertion portion 2311 of the guide rail 231 may have an embossing and an engraving formed therein, so that the guide block 232 may be prevented from being separated from the guide rail 231. In addition, in order to minimize a friction between the guide rail 231 and the guide block 232, a member having a small friction force or a ball bearing 2324 may be inserted between the guide groove 2321 of the guide block 232 and the insertion portion 2311 of the guide rail 231. As a material having the small friction force, a member 2325 having strong abrasion resistance, low frictional resistance, and self-lubrication, such as polyoxymethylene (POM), may be added inside the guide groove 2321.

FIG. 16 is an embodiment in which the screw 2313 is fastened in a lateral direction of the guide rail 231. Further, FIG. 17 illustrates an embodiment in which the screw 2313 is fastened to a rear face of the guide rail 231. In a case of FIG. 16, a size of the mobile terminal in a width direction may be reduced, and in the embodiment of FIG. 17, a height of the mobile terminal may be reduced. The guide rail 231 and the guide block 232 may be arranged in a thickness direction of the mobile terminal, or may be arranged side by side in the third direction. Taking FIG. 16B as an example, a vertical direction in the drawing may be the vertical direction of the mobile terminal, or may be the thickness direction of the mobile terminal.

When assembling, the fastening of the second front portion 1021 of the second frame 102 with the guide rail 231 may be performed after mounting the second front portion 1021 on the front face of the first rear portion 1012 as shown in FIG. 10B. As such, in a bottom-up scheme of stacking up components from the rear face, it is easier to perform the fastening of the screw 2313 from the front face in the rear face direction. Thus, the guide block 232 and the guide rail 231 may be arranged in the third direction in the embodiment of FIG. 16, and may be arranged in the thickness direction of the mobile terminal 100 in the embodiment of FIG. 17.

FIG. 18 illustrates an embodiment in which the insertion portion 2311 of the guide rail 231 has a T-shape and the guide block 232 includes the guide groove 2321 in a shape surrounding the insertion portion 2311. The guide rail 231 and the guide block 232 of such shapes have a larger contact area between the guide rail 231 and the guide block 232 than in the above-described embodiment, so that the guide rail 231 and the guide block 232 may be more stably supported, but a frictional force may occur. In order to prevent this, the polyoxymethylene material may be formed on a portion of the guide block 232 in contact with the guide rail 231 in a double injection-molding scheme to reduce the frictional force. A groove may be defined in a top face of the guide block 232 such that the polyoxymethylene adheres well to the guide block 232, and the polyoxymethylene may be also injected into the groove in the top face of the block to form a POM rail as shown in FIG. 18B. The guide rail 231 may be extrusion-molded by drawing a metallic material, or a plate-shaped member may be press-bent to implement the T-shape. It is possible to implement a beam-shaped member having a T-shaped cross section by folding the plate-like member in half and extending the end outward. The plate-shaped member may be folded in half and an end thereof may be extended outward to implement a beam-shaped member.

The mobile terminal of the present disclosure as described above may secure a component mounting space therein through the driving unit 200 positionally biased to one side. The second frame 102 may stably move in the first direction through the linear guide 1515 that guides the movement of the second frame 102 in the first direction.

In addition, the display unit 151 may be stably fixed through the fixing structure such that the display unit 151 may be prevented from damaging by the force applied to the bent curved face of the display unit 151.

As the present features may be embodied in several forms without departing from the characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be considered broadly within its scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalents of such metes and bounds, are therefore intended to be embraced by the appended claims. 

What is claimed is:
 1. A mobile terminal comprising: a first frame; a second frame slidably-movable with respect to the first frame in a first direction or in a second direction opposite to the first direction; a slide frame movable with respect to the second frame in the first direction or in the second direction; a flexible display unit including a first region coupled to the first frame, a second region coupled to the slide frame, and a third region positioned between the first region and the second region, wherein the third region is bent while being rolled in the second frame; a driving unit disposed to be positionally biased in a third direction perpendicular to the first direction, wherein the driving unit provides a force to control a slide movement of the second frame; and a linear guide positioned between the first frame and the second frame, wherein the linear guide guides a movement of the second frame in the first direction or in the second direction.
 2. The mobile terminal of claim 1, wherein the linear guide is one of a pair of linear guides respectively disposed at each end of each of the first frame and the second frame in the third direction.
 3. The mobile terminal of claim 1, wherein the linear guide includes: a guide rail coupled to one of the first frame or the second frame and extendable in the first direction; and a guide block coupled to the other of the first frame or the second frame and comprising a guide groove for inserting the guide rail in the guide block, wherein the guide rail has a plurality of screw holes for coupling with the one of the first frame or the second frame.
 4. The mobile terminal of claim 3, wherein the linear guide includes a bearing ball or a polyoxymethylene (POM) rail of the guide block positioned between the guide rail and the guide block.
 5. The mobile terminal of claim 1, wherein the driving unit includes: a motor coupled to the first frame; a planetary gear connected to the motor; a pinion gear for receiving a force through the planetary gear; and a rack gear fastened to the second frame and extendable in the first direction, wherein the rack gear is engaged with the pinion gear to convert a rotational force of the pinion gear into a linear motion.
 6. The mobile terminal of claim 1, wherein a first end of the flexible display unit forms a curved side in the second direction, wherein the first frame further includes: a curved side bracket for supporting a rear side of the first end of the flexible display unit; and a display decor opposite to the curved side bracket and covering a front side of the first end of the flexible display unit.
 7. The mobile terminal of claim 1, wherein the first frame includes: a first front portion to be coupled with the first region of the flexible display unit; and a first rear portion spaced apart from the first front portion in a rearward direction, wherein the second frame includes: a second front portion positioned at a rear side of the first front portion; and a second rear portion for covering a portion of a rear side of the first rear portion, wherein the mobile terminal further includes an optical component disposed at an exposed rear portion of the first rear portion.
 8. The mobile terminal of claim 7, further comprising: an electronic component disposed between the first front portion and the first rear portion; and a separating plate for covering a front side of the electronic component, wherein the second front portion moves between the first front portion and the separating plate.
 9. The mobile terminal of claim 7, wherein the slide frame is slidably coupled to a rear side of the second rear portion in the first direction, and wherein the second frame further includes a rear side cover for covering the slide frame and a portion of the flexible display unit positioned on the second rear portion.
 10. The mobile terminal of claim 1, further comprising: a display flexible substrate extendable from an end of the second region of the flexible display unit; and a main board mounted on the first frame, wherein the display flexible substrate is rolled on a roller and fastened to the main board.
 11. The mobile terminal of claim 1, further comprising: a support frame coupled to a second side of the third region of the flexible display unit, wherein the support frame includes a plurality of grooves in a second side of the support frame, wherein the plurality of grooves extend in the third direction.
 12. The mobile terminal of claim 11, wherein the first frame further includes a first front portion positioned on a rear side of the first region of the flexible display unit, and wherein the support frame has a thickness corresponding to a thickness of the first front portion.
 13. The mobile terminal of claim 1, wherein a moving distance in the first direction of the second frame with respect to the first frame is equal to a moving distance in the first direction of the slide frame with respect to the second frame.
 14. The mobile terminal of claim 1, wherein the first frame includes an exposed rear portion not covered by overlapping the flexible display unit, wherein the mobile terminal further includes a camera positioned at the exposed rear portion.
 15. The mobile terminal of claim 1, wherein the second frame further includes: a side frame located at an end of the second frame in the first direction and covering at least a portion of the third region of the flexible display unit. 